Document Type and Number:
Japanese Patent JPS53134967
Kind Code:
U
Application Number:
JP4052677U
Publication Date:
October 25, 1978
Filing Date:
March 31, 1977
Export Citation:
International Classes:
G04B19/20; G04C17/00; G09F9/30; G09F9/37; (IPC1-7): G04B19/20; G04C17/00; G09F9/30